\(a,\dfrac{27}{36}=\dfrac{27:9}{36:9}=\dfrac{3}{4}\\ b,\dfrac{72}{96}=\dfrac{72:24}{96:24}=\dfrac{3}{4}\\ c,\dfrac{55}{110}=\dfrac{55:55}{110:55}=\dfrac{1}{2}\\ d,\dfrac{88}{99}=\dfrac{88:11}{99:11}=\dfrac{8}{9}.\)

\(\dfrac{17}{2}\times\dfrac{3}{5}+\dfrac{3}{5}\times\dfrac{1}{2}+\dfrac{3}{5}\times1\\ =\left(\dfrac{17}{2}+\dfrac{1}{2}+1\right)\times\dfrac{3}{5}\\ =10\times\dfrac{3}{5}\\ =6\)

`A=1+3+9+27+...+2187`

\(A=3^0+3^1+3^2+3^3+...+3^7\\ 3A=3^1+3^2+3^3+3^4+...+3^8\\ 2A=3^8-1\\ A=\left(3^8-1\right):2=3280\)

bẹn ghét ai nhất tronh hoc24 ?

cho táu hỏi trong đây cóa bao nhiêu cặp vậy ạ :>>>